Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.4 Pro is clearly ahead on the aggregate, 94 to 55. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4 Pro's sharpest advantage is in coding, where it averages 89 against 32.7. The single biggest benchmark swing on the page is LiveCodeBench, 86 to 21.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $0.10 input / $0.40 output per 1M tokens for Gemini 3.1 Flash-Lite. That is roughly 450.0x on output cost alone. GPT-5.4 Pro is the reasoning model in the pair, while Gemini 3.1 Flash-Lite is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 1M for Gemini 3.1 Flash-Lite.
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Gemini 3.1 Flash-Lite only becomes the better choice if you want the cheaper token bill or you would rather avoid the extra latency and token burn of a reasoning model.
GPT-5.4 Pro
88.8
Gemini 3.1 Flash-Lite
51.2
GPT-5.4 Pro
89
Gemini 3.1 Flash-Lite
32.7
GPT-5.4 Pro
98
Gemini 3.1 Flash-Lite
63.1
GPT-5.4 Pro
96.7
Gemini 3.1 Flash-Lite
64
GPT-5.4 Pro
97
Gemini 3.1 Flash-Lite
79
GPT-5.4 Pro
97
Gemini 3.1 Flash-Lite
73
GPT-5.4 Pro is ahead overall, 94 to 55. The biggest single separator in this matchup is LiveCodeBench, where the scores are 86 and 21.
GPT-5.4 Pro has the edge for knowledge tasks in this comparison, averaging 88.8 versus 51.2. Inside this category, HLE is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for coding in this comparison, averaging 89 versus 32.7. Inside this category, LiveCodeBench is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for math in this comparison, averaging 98 versus 63.1. Inside this category, HMMT Feb 2023 is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for reasoning in this comparison, averaging 96.7 versus 64. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for instruction following in this comparison, averaging 97 versus 79. Inside this category, IFEval is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for multilingual tasks in this comparison, averaging 97 versus 73. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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